风力发电机变桨轴承微动磨损与防护.pdf

2009 12 Dec2009 34 12 LUBRICATION ENGINEERING Vol34 No12 DOI: 103969/jissn0254 0150200912028 ( 610031) : , , , , : ; , , : ; ; ; : TH 13333 : A : 0254 0150 ( 2009) 12 110 3 Analysis of FrettingW ear and Fretting Protection forW ind Turbine Pitch Bearing W ang S mi ing S h i X ai oHui X u M inghe ng ( School ofM echanicalEngineering, Southwest Jiaotong University, Chengdu Sichuan 610031, China) Abstract: The vibration loads and the failuremodes of pitch bearingwere analyzed. Itwas pointed out that in the action of alternating loads and vibration loads on w ind turbine pitch bearings, itsm ain failure modew as the dam age due to the frettingw ear that occurs between rolling elem ent and race. Them echan ism of frettingwearwas analyzed through the fretting tests, which also can explain the relationship betw een lubrication effects and the number of frettingmovem ent, and the dis p lacem ent of frettingmovem ent. In order to reduce fretting w ear in the p itch bearings, the specific protectivem easures against fretting wearw ere proposed in lubrication andm ach inery. The results show that the effects of frettingw earweaken as load decreases, contact angle increases and hardness ofm aterial increases; the fretting wear in the pitch bearing can be reduced by the use of synthetic grease that has high penetration capability and contains antiw ear add itives and anticorro sion agent, reducing the vibration ofb lades, mi proving the structure of pitch bearing and increasing the intensity of the sur face of ring, etc. Keywords: w ind turbine; pitch bearings; fretting w ear; vibration load ,